[ https://issues.apache.org/jira/browse/HBASE-15648?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Michael Stack resolved HBASE-15648. ----------------------------------- Resolution: Later No progress. Old. Resolving as 'Later'. > Reduce number of concurrent region location lookups when MetaCache entry is > cleared > ----------------------------------------------------------------------------------- > > Key: HBASE-15648 > URL: https://issues.apache.org/jira/browse/HBASE-15648 > Project: HBase > Issue Type: Sub-task > Components: Client > Affects Versions: 1.2.0, 1.3.0 > Reporter: Mikhail Antonov > Assignee: Mikhail Antonov > Priority: Major > Fix For: 3.0.0, 2.3.0, 1.7.0 > > Attachments: HBASE-15648-branch-1.3.v1.patch > > > It seems in HConnectionImplementation#locateRegionInMeta if region location > is removed from the cache, with large number of client threads we could have > many of them getting cache miss and doing meta scan, which looks unnecessary > - we could empty mechanism similar to what we have in IdLock in HFileReader > to fetch the block to cache, do ensure that if one thread is already looking > up location for region R1, other threads who need it's location wait until > first thread finishes his work. -- This message was sent by Atlassian Jira (v8.3.4#803005)